Heater



C. F. DALY Jan. 2, 1951 HEATER 2 Sheets-Sheet 1 Filed April 5, 1948 C. F. DALY Jan. 2, 1951 HEATER 2 Sheets-Sheet 2 Filed April 5, 1948 Patented Jan. 2, 1951 UNITED STATES PATENT OFFICE- HEATER Charles F. Daly, Boston, Mass. Application April 5, 1948, Serial No. 18,980

My present invention is a novel and improved tubular heater utilizing an immersed multi-pass water tube calandria and includes a novel combination of the tubes as a part of the bafiie arrangement.

My present construction results in an exceptionally high degree of efilciency in extracting heat from the combustion gases as they are conducted around the tubes and baflies from the heat generating chamber to the flue. Thus by utilizing a plurality of calandria or a plurality of battles and separating the tubes into distinct portions of the path of the combustion gases from the heater to the flue, I am enabled to bring the water temperature in the boiler to a high elliciency of heat before the combustion gases escape thru the flue.

Furthermore, my present arrangement is extremely simple in construction, readily facilitates cleaning when desired, and will maintain its efficiency with any type of fuel.

Further features, advantages, and novel combinations will be hereinafter more fully pointed out and claimed.

Referring to the drawings illustrating preferred embodiments:

Fig. 1 is a diagrammatic cross-sectional View of a standard type of heater embodying one form of my invention;

Fig. 2 is a cross-sectional view on the line 2-2 of Fig. 1;

Fig. 3 is a corresponding view of a modification in which the immersed water tubes are in a plurality of sections, and

Fig. 4 is a cross-sectional view on the line 4-4 of Fig. 3..

As shown in Fig. 1, a heater of any suitable size, type, and area for the purpose to which it is to be applied is illustrated, having awater jacket and a plurality of immersed tubes forming a calandrla which are divided by one or more baffles into .a series of passages for the products of combustion from the heating chamber to the flue. As shown, the heater comprises an outer jacket casing l, bottom 2, and removable top 3, constituting the outer wall of the heater. A fire box has an inner wall 5, bottom 5, and top 1, preferably domed as illustrated in'Fig. 1, and with a feed door, H) with side walls II and .top and bottom flanges l2 and 13 opening thru to the fire box I and, thus, enclosing the water chamber 20 in combination with the outer casing l. A water supply pipe 22 to any suitable source is provided at the bottom and an outlet 2| at; the top, as shown, forj steam or not water flowing from the heater.

2 Claims. (01. 122-145) The heater is sui'ficiently high in extent to contain the water chamber 24 between the casing I and an inner partition '25 formed with top and bottom frames 26 and 21, which contain a plurality of tubes 30--30 extending from the lower water chamber 20 to the upper water chamberjl. These water tubes '30 are open at each end and held with a wedging fit or welded, if desired, in appropriate openings in the top and bottom frames 26 and 21, which tubes are thus in open communication between the water in the top chamber 24 and the lower one 20.

The side walls 25 and 26 may be secured in any suitable manner to the casing l and to sup-. port the same and the plurality of tubes in posi-' tion as. shown, a convenient means being the clean-out openings thruthe side walls asfindicated at 33, 34, and 35, together with the walls 36 of the flue opening 40. Intermediate the frame members or tube plates 26 and 21 I supply one or more 'bafile plates, shown here as one plate 44, having a plurality of openings therein thru which the tubes 30 are fitted, also by a wedging water-tight fit, or they may be welded thereto, as indicated at 45. This baffle plate 44 extends diametrically across the upper part of the heater, leaving an opening from the lower part of the baflle to the upper, as indicated at 48. Thus the products of combustion from the fire box 50 extending upwardly thru a flue opening 50 is deflected by the intermediate baffle plate 44 in the direction shown by the arrows surrounding the water-immersed tubes 30, and then in reverse direction around the upper part of the immersed tube 30 and out of the flue 40.

I may, if desired, arrange a plurality of such intermediate baffle plates, thus giving a series of draft-conducting areas for the products of combustion from the fire box IE to the draft outlet "Land thereby I am enabled to maintain the combustion gases in the water tube calandria area of the heater, thereby extracting the heat, from the combustion gases with a minimum of loss.

Referring to the modified form shown in Figs. 3 and 4, I have illustrated a substantially similar heater construction with the outer casing I and extendingcbetween tight fitting recesses in the top plate t0 and a lower supporting plate 68, and

thereby opening into a central water chamber recess or manifold 10. A second set of water tube calandria 'H-'H are fitted between the plate 15 and the lower plate 27, as shown in Fig. 3. The intermediate baflles 66 and 15 are united around the area by a vertical partition 11 to thus insure the tightness of the water jacket and manifold and conduct, the products of. combustionv from the fire box 1& thru the; opening: 8!) to the. draft outlet 40 in the direction of the arrows, conducting the heat around the immersed sections of the. difierent sets of immersed tubes 65 and H as well fold 10.

In this form, I have illustrated a lowermost water-receiving chamber 8| around; the. base. at

the fire box into which the heated water -'as heating the water in the jacket 24 and mania circulate thru a series otj'b'penings 82 in the rim M of thebottom plate. 6210f the fire box..

Thus;- it will lee-seen that by: utilizing a plurality of water tube calandria ihzcombination with baflie plates or a plurality of" sets of cal'andria, opening into different portions of the jacketed water chamber in a heater: and. conducting the flue gases therearoundyI have produced a novel,

' simple, and efficient construction with a; high deeating, with said combustion chamber traversing said boiler. and being traversediby said risers, and Being adapted and arranged to conduct hot gases of combustihn back and. forth through said boiler,

thereby providing hot surfaces in contact with the main boiler Water supply and further heating the water in said risers passing through said fiues, said risers being 50 positioned in the path of said flue gases as to delay the flow thereof and to cause them to yield maximum heat before escaping to the stack.

2 A. boiler of. the kind. described. comprising a. combustion .chambenan outer. shell spaced from said combustion chamber and partially surrounding the same, an opening at the bottom portion of the shell to admit water to the space between said shell and the Walls of said combustion chamber, a plurality of water tubes extending verticalIy' from adjacent the top of the combustion chamber tothe upper portions of said boiler, a flue. extending from said combustion chamber traversing said boiler and being traversed by said water tubes, baflie plates cooperating with the watertu'bes to conduct gases of. combustion back and; forth thru the; boiler providing; hot. surfaces in contact with the main boiler water and. further heating the water in said tubes, said tubes. being so positioned in the path of the flue gases as to delay the flow thereof and. cause. them to;

yield maximum heat before escaping; out of the. flue. 1

CHARLES F; DAEY.

REFERENCES CITED The following; references are of. IQCQId: in; the file. of. this. patent UNITED? STATES PATENTS Number Name Date 610,631 JOY 38131213, 1898' 15 31316925 .HOIiuChi. Aug. 19 1919. 245,322 Bork June 1'9, I941 2351,32]. Cl'OtfiY 0.617. I2; 1948 

